removing withGHCDummyFile.

Language/Haskell/GhcMod/Info.hs

@@ -37,19 +37,22 @@ infoExpr :: Options
          -> FilePath     -- ^ A target file.
          -> Expression   -- ^ A Haskell expression.
          -> IO String
-infoExpr opt cradle file expr = (++ "\n") <$> withGHCDummyFile
-    (inModuleContext opt cradle file (info opt file expr) "Cannot show info")
+infoExpr opt cradle file expr = withGHC' $
+    inModuleContext opt cradle file (info opt file expr)
 
 -- | Obtaining information of a target expression. (GHCi's info:)
 info :: Options
      -> FilePath     -- ^ A target file.
      -> Expression   -- ^ A Haskell expression.
      -> Ghc String
-info opt file expr = do
-    void $ Gap.setCtx file
-    sdoc  <- Gap.infoThing expr
-    (dflag, style) <- getFlagStyle
-    return $ convert opt $ showPage dflag style sdoc
+info opt file expr = convert opt <$> ghandle handler body
+  where
+    body = do
+        void $ Gap.setCtx file
+        sdoc <- Gap.infoThing expr
+        (dflag, style) <- getFlagStyle
+        return $ showPage dflag style sdoc
+    handler (SomeException e) = return $ "Cannot show info (" ++ show e ++ ")"
 
 ----------------------------------------------------------------
 
@@ -71,10 +74,8 @@ typeExpr :: Options
          -> Int          -- ^ Line number.
          -> Int          -- ^ Column number.
          -> IO String
-typeExpr opt cradle file lineNo colNo = withGHCDummyFile $
-    inModuleContext opt cradle file (types opt file lineNo colNo) errmsg
-  where
-    errmsg = convert opt ([] :: [((Int,Int,Int,Int),String)])
+typeExpr opt cradle file lineNo colNo = withGHC' $
+    inModuleContext opt cradle file (types opt file lineNo colNo)
 
 -- | Obtaining type of a target expression. (GHCi's type:)
 types :: Options
@@ -82,12 +83,16 @@ types :: Options
       -> Int          -- ^ Line number.
       -> Int          -- ^ Column number.
       -> Ghc String
-types opt file lineNo colNo = do
-    modSum <- Gap.setCtx file
-    (dflag, style) <- getFlagStyle
-    srcSpanTypes <- getSrcSpanType modSum lineNo colNo
-    let tups = map (toTup dflag style) $ sortBy (cmp `on` fst) srcSpanTypes
-    return $ convert opt tups
+types opt file lineNo colNo = convert opt <$> ghandle handler body
+  where
+    body = do
+        modSum <- Gap.setCtx file
+        (dflag, style) <- getFlagStyle
+        srcSpanTypes <- getSrcSpanType modSum lineNo colNo
+        let tups = map (toTup dflag style) $ sortBy (cmp `on` fst) srcSpanTypes
+        return $ tups
+    handler (SomeException _) = return errmsg
+    errmsg = [] :: [((Int,Int,Int,Int),String)]
 
 getSrcSpanType :: G.ModSummary -> Int -> Int -> Ghc [(SrcSpan, Type)]
 getSrcSpanType modSum lineNo colNo = do
@@ -129,14 +134,12 @@ pretty dflag style = showOneLine dflag style . Gap.typeForUser
 noWaringOptions :: [String]
 noWaringOptions = ["-w:"]
 
-inModuleContext :: Options -> Cradle -> FilePath -> Ghc String -> String -> Ghc String
-inModuleContext opt cradle file action errmsg = ghandle handler $ do
+inModuleContext :: Options -> Cradle -> FilePath -> Ghc String -> Ghc String
+inModuleContext opt cradle file action = do
     void $ initializeFlagsWithCradle opt cradle noWaringOptions False
     setTargetFiles [file]
     void $ G.load LoadAllTargets
     action
- where
-   handler (SomeException _) = return errmsg
 
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